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<title>Core Preform</title>
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<h1><a href="../index.html">
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<ul><li><a href="../index.html">home</a></li>
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<main role="main">
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<!--Weave of 'Core Preform' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">core</a></li><li><a href="index.html#1">Chapter 1: Control</a></li><li><b>Core Preform</b></li></ul></div>
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<p class="purpose">To load, optimise and throw problem messages related to Preform syntax.</p>
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<ul class="toc"><li><a href="1-cp2.html#SP1">§1. Reading Preform declarations from Syntax files</a></li><li><a href="1-cp2.html#SP2">§2. Converting Preform errors to problems</a></li><li><a href="1-cp2.html#SP4">§4. Optimisation</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Reading Preform declarations from Syntax files. </b>At present we do this only when <span class="extract"><span class="extract-syntax">L</span></span> is English, but the infrastructure is general.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CorePreform::load</span><span class="plain-syntax">(</span><span class="identifier-syntax">inform_language</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">L</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't load preform from null language"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><span class="identifier-syntax">Languages::path_to_bundle</span><span class="plain-syntax">(</span><span class="identifier-syntax">L</span><span class="plain-syntax">), </span><span class="identifier-syntax">I</span><span class="string-syntax">"Syntax.preform"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminals_declared</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LoadPreform::load</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"%d Preform nonterminals read from %f\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nonterminals_declared</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminals_declared</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Converting Preform errors to problems. </b>Errors in Preform syntax are generated in the <a href="../words-module/index.html" class="internal">words</a> module, and are
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ordinarily issued in a low-level way, with terse lines printed to <span class="extract"><span class="extract-syntax">STDERR</span></span>.
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Providing the following allows us to give the Inform user a fuller message:
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">PREFORM_ERROR_WORDS_CALLBACK</span><span class="plain-syntax"> </span><a href="1-cp2.html#SP2" class="function-link"><span class="function-syntax">CorePreform::preform_error</span></a>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CorePreform::preform_error</span><span class="plain-syntax">(</span><span class="identifier-syntax">word_assemblage</span><span class="plain-syntax"> </span><span class="identifier-syntax">base_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nt</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">production</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pr</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">message</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pr</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"The production at fault is:\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Instrumentation::log_production</span><span class="plain-syntax">(</span><span class="identifier-syntax">pr</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">); </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_nonterminal</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_text</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">message</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP7" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">Untestable</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">WordAssemblages::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">base_text</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wa</span><span class="plain-syntax">(5, &</span><span class="identifier-syntax">base_text</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"I'm having difficulties conjugating the verb '%5'. "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">TEMP</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pr</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_number</span><span class="plain-syntax">(3, &(</span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="identifier-syntax">match_number</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ptoken</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr</span><span class="plain-syntax">-></span><span class="identifier-syntax">first_pt</span><span class="plain-syntax">; </span><span class="identifier-syntax">pt</span><span class="plain-syntax">; </span><span class="identifier-syntax">pt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">next_pt</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Instrumentation::write_ptoken</span><span class="plain-syntax">(</span><span class="identifier-syntax">TEMP</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">next_pt</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">TEMP</span><span class="plain-syntax">, </span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">TEMP</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"There's a problem in Inform's linguistic grammar, which is probably "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"set by a translation extension. The problem occurs in line %3 of "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%1 ('%4'): %2."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"There's a problem in Inform's linguistic grammar, which is probably "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"set by a translation extension. The problem occurs in the definition of "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%1: %2."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">TEMP</span><span class="plain-syntax">)</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>And similarly for inflections.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">PREFORM_ERROR_INFLECTIONS_CALLBACK</span><span class="plain-syntax"> </span><a href="1-cp2.html#SP3" class="function-link"><span class="function-syntax">CorePreform::inflections_problem</span></a>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CorePreform::inflections_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nt</span><span class="plain-syntax">, </span><span class="identifier-syntax">inform_language</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nl</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">err</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nl</span><span class="plain-syntax">) </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">nl</span><span class="plain-syntax">-></span><span class="identifier-syntax">instance_name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">err</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_nonterminal</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">nt</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP7" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">Untestable</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"An error occurred with the Preform syntax used to specify the grammar "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"of source text. If this occurs with English, that's a bug in the compiler, "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"and should be reported. But if it occurs with languages other than English, "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"there's an issue with the language definition, which should be reported "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"to its maintainer. At any rate, this compilation can't go further. "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nt</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%PThe nonterminal causing problems is %3. "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nl</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%PThe natural language affected is '%1'. "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%PThe problem as reported by Preform is: %2."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Optimisation. </b>The following is fine-tuning for speed: if it weren't here, the compiler would
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still function, but would be slower. With that said, it's possible to break
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things by making the wrong settings here, so be wary of making changes.
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</p>
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<p class="commentary">Setting up happens in two stages. Firstly, when this module (and therefore
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the compiler) starts up, certain internally-defined Preform nonterminals —
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those defined by functions in the code, not loaded from Syntax files — need
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to be marked with NT incidence bits. (See <a href="../words-module/4-ni.html" class="internal">Nonterminal Incidences (in words)</a>.)
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CorePreform::set_core_internal_NTIs</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">CorePreform::set_core_internal_NTIs</span></span>:<br/>Core Module - <a href="1-cm.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NTI::give_nt_reserved_incidence_bit</span><span class="plain-syntax">(</span><span class="function-syntax"><s-adjective></span><span class="plain-syntax">, </span><span class="identifier-syntax">ADJECTIVE_RES_NT_BIT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NTI::give_nt_reserved_incidence_bit</span><span class="plain-syntax">(</span><span class="function-syntax"><s-object-instance></span><span class="plain-syntax">, </span><span class="identifier-syntax">PROPER_NOUN_RES_NT_BIT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>Later on, the <a href="../words-module/index.html" class="internal">words</a> module calls the following function to mark that a
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match to the given nonterminal must contain only words with certain NTI bits:
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for example, a match to <k-kind> has to contain words with either the <article>
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bit or the <k-kind> bit set, which as we see above is <span class="extract"><span class="extract-syntax">COMMON_NOUN_RES_NT_BIT</span></span>.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">MORE_PREFORM_OPTIMISER_WORDS_CALLBACK</span><span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::set_core_internal_requirements</span></a>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CorePreform::set_core_internal_requirements</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NTI::every_word_in_match_must_have_my_NTI_bit</span><span class="plain-syntax">(</span><span class="function-syntax"><s-adjective></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><s-object-instance></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><k-kind-variable></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><k-formal-variable></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><k-base-kind></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><k-kind-construction></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><k-kind></span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="1-cp2.html#SP5" class="function-link"><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span></a><span class="plain-syntax">(</span><span class="function-syntax"><k-kind-of-kind></span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CorePreform::mark_nt_as_requiring_itself_articled</span><span class="plain-syntax">(</span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nt</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NTI::every_word_in_match_must_have_my_NTI_bit_or_this_one</span><span class="plain-syntax">(</span><span class="identifier-syntax">nt</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NTI::nt_incidence_bit</span><span class="plain-syntax">(</span><span class="function-syntax"><article></span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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</pre>
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